Waterproofed wall-board.



J. H. THICKENS.

WATERPROOFED WALL BOARD.

APPLICATION FILED DEC. 5. 1914.

Patented Juiy 11, 1916.

,Tomi E. mem',

F BUFFALO, NEW YORK, ASSIGNOR TO THE :BEAVERl COMPpANY,

OF BUFFALO, NW YOlvK, A CORPORATION 0F OHIO.

wa'rnarnoornn wann-roam).

I To all 'whomI t may concern.'

Be it known .thatvI, JOHN H. THICKENS;

a citizen of theUnited States, residin at,

use. v Wall board may be'made 'from Wood fiber or kwood pulp, eitherv ground wood pulp waste paper or cooked pulp, used alone or intermixed, vand .ordnarily'is marketed in substantially rigid sheets 4to 16-feet long 'and 24 to 72 inches wide, and of a thickness approximating of an inch. The wall board may consist of a single layer of material or of a; plurality of plies. pasted or cemented together. Generally'it 1s used as a building material by nailing or tacking it L directly to the studding of a room, so that it may serve in place of lath and plaster as the inner ,wall of the room-,being ornamented with paint or the like as desired,

The wall board, as manufactured, contains a certainpercentage of moisture, and

also has the characteristic 0f changing in its moisture content .in accordance with the s5- humidity of the surrounding air, these changes ordinarily being slow butnever-A theless appreciable. v

It is the^object of the present invention to so limitand Aregulate the changes in mois- 40 ture content in wall board while in use that the progressive shrinking or swelling of the board shall not result in appreciable warping or bulging, and this result' is attained by giving to the board, as manufactured, an

unequal or differential i sizin 'on its front and back sides, so that when lnstalled in the place where'it is to be used, the exposed or front face can be coated with paint, or the like, thereby bringing the moisture repelling ower of the front ,side upto that of the ack side, leaving the wall board ultimately in such condition that the ltwo -sidesareuniform in" their power to take on: or give 0`t`= moisture.

S5 More particularly, it istheiobiect of the".

present invention tgr'apply .to the backside Specification of Letters Patent. y

warping and bulgingof the board during y Y factory for the back ofthe board:

' proofcoating is more e Patented J uly 11, 1916.

Application ltiled December 5, 1914. Serial No. 875,599.

of the wall board more waxy material than is applied to the front face, this difference being regulated to correspond roughly with the' protective action ofvpaint as ordinarily applied to the front face of such boards for decorative purposes. It is possible to secure v l the excess of waxy material on the back side' of the board by applying to that' side -a heavier coating of the size, but in the preferred embodiment the sizing used for the back is richer in waxy material, so that agreater protection is secured even though the quantity of size be not materially greater than that applied to the front.

The details ofthe present invention, together with furthe'i` objects and advantages,

'will become clear from the following de--= tailed description, taken in conjunction.

with the accompanying diagrammatic draw- 73j the present invention may vary in composition, but for wall board of wood'V pulp I,fiber as now ordinarily manufactured, the following composition is, satisfactory for 'the 85 front faceof the product:

Ras .37% Wax 16% Solvent I17% @o The wax maybe paralinor its equivalent, and as a volatile'solvent-I prefer to use naphtha. i

The following has been'found very satis Resin 32% Wax 25% Solvent 4:3957.-

' N Changes in the composition may be made with advantage to correspond with different kinds of stock and vthe extent to which the boards are to be'water-proofed, and when the percentage of wax is hiig'h, the moisturey ective than with 105 lower percentages of wax. But it is im- .possible to usev a very large percentage 'of wax, on the front of the board, because of theifa'ct-"tht'the paintin which lmust be done on this surface is lia le thereby to be streaked and to flake of-inlo'urse of time. l Not only is it advisable to usel a dierent i rool position fo a small quantitypof size is to be applied, the

' composition of material on the -back of the panel, but a larger quantity can be einployed advantageously, tor` while goodresults'can bobtained by usingithe e cointhe face and, back (by greatly increasing theY quantity on the bac and using a composition-not too high Vin wax) better results are'obtained by using on the back, a composition richer in wax and applying it in larger quantity than on the front.

When very large quantities of size are employed, the` board is run through a bath having a composition which is suitable for the face of the board. lt is allowed to remain A15 in this bath for a period of time suiiicien't to permit absorption of the desired quantity of size, after whic it is passed through -squeeze rolls where the excess, adhering to the surface is squeezed ofi?. 'lhe board is tliendpassed throughcoating rolls which put -an a dit-inal and ,preferably riclierj coat on y the-back but leave the front as itl was. `lllig.' 1 'illustrates such a' board, wherein the sizing at the front 1 is indicatedby the shade' 25 ing lines and the corresponding and simult'aneously applied sizing on the back 2 is f indicated by similar lines, and wherein the additional and heavier shading lines at the back indicate the additional and preferably richer coat subsequently put on. When only board may be passed through sizing appara- 'tus consisting of two rolls, one of which is' immersed in asolution for the back of the board, and to the other of which is attached a trough into which size suitable for the face 1s pumped, and by which the size for the face is applied simultaneously with the ap.

fj-linesfot'shading-and the simultaneously ap- 5o plied sizing for.4 theback 14 is shown with` eaviei" 'shading to indicate its A greater richness i waxgor-'its equivalent. Where all othesize is of .the same composition and?l is -appliedI to the back in .55 xg-renter quantity than to the front,'.or is of fdi'iifelrent composition' with a greater wax n' 'contention the .ba-ck, `or is aA combination of these two'7i'(tha't ,-is',"`a.richer mixture for the Q back and also` applied in greater quantity);

therewill^` resultaaboard water-proofed-'in ,diii'eiential in'aniie'r 'withmore waxy material `oii` the back than on the front, and, v therefore,1'moreresistant at theback'to the'V present substantially menace i' 'penetration of moisture into the board or for the escape -of moisture from the-board.

The rogressive changes in moisture content in a.v oard so coated are slow enough to permit commercial marketing of the board without serious warping or bulging, and after the board has been installed in a building,-a's by permanent attachment to the studding with nails, or in other suitable manner,

' the coatings of paint, or the like, ordinarily applied to the face of the board for purposes of ornamentation, bring'u the moisture repolling' .character of the ront face so that it substantially equals that of the back face,

and thereafter throughout years of use, the y iront and back faces of the board will work together in transmitting moisture to or from the inner part of the board, and neither face will preponderate over the other to an extent sudicient to cause detrimental' bulging or warping of the board. It may slowly shrink as the natural moisture in the board leaves it, and it may slowly expand with prolonged humid atmospheric conditions, but the lines of expansion and contraction lie in the plane .of the board,and will |be taken care of at the points of attachment to the studding, and the lateral deformations which have heretofore been so troublesome with wall board are thus inA large measure remedied.V f

][claim: v 1. A rigid -wall board of wood ber, sized on the back more than lon the front, sothat the subsequent decoration of the board may equalize the resistance to moisture "of both sides of the board and reduce warping glue to unequal expansion.

2. A wall board of wood pulp, sized von both the front and back sides, the sizing on the back being more resistant to moisture than the. sizing on the front, so 'that when the board is installed and decorated,` it will equal resistance to moisture on both sides.

- a. A. wan board of wood pulp, size- 1 @a both the front'and back sides, the sizing on the e back containing, more waxy material than that on the front, so that the subsequent decoration vof the board may equalize theresistance to moisture of'both 'sides-of the board; substantially as descrrbed..

4. -A rigid wall board. f woodbercoatedl on the front-with a sizing of about 37% resin, 16% wax and'47% solvent, and coatedon the back with a sizing of about 32% "resin, 25% ,wax and 43% solvent substana tia'lly as described. .y y Y .ln testimony whereof ll amx -my signature,in presence oftwo witnesses iis.`

.Jona n. antennas 

